If your gonna take your rock out to cook it I wouldn't suggest buying more cause chances are they might have more bryopsis on it and you would be starting all over again....I think if you take out half and cook it then put it back in your tank, then take out the other half and cook it and you should be good to go!!..
Also You should stop using Kent PH Buffer up, you PH should be at 8.1/8.2 not 8.2/8.4....you will find that if you stop using this product your ph will balance itself at 8.2
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500G Mixed Reef

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Electrician, Electronics Technician, I can help with any electrical questions you might have!!
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Kevin
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